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Rock Stability
Verification according to the theory of limit states
When performing verification according to the theory of limit states the program reduces material parameters of rocks (angle of internal friction or tangent of the angle of internal friction, cohesion) using partial coefficients entered in the frame "Settings".
Verification condition has the form:
| where: | Tpos | - | shear forces along the slip surface |
| Tvzd | - | passive forces along the slip surface | |
| γs | - | coefficient of the overall stability of the structure |
When analyzing the polygonal slip surface the program compares the calculated value with the value corresponding to the fully stressed design (state of equilibrium with zero reserve). Verification condition has the form:
| where: | FS | - | factor of safety calculated with the reduced material parameters |
| γs | - | coefficient of the overall stability of the structure |
Recommended partial coefficients according to EC7:
| - coefficient of reduction of the angle of internal friction | γmφ = 1.25 |
| - coefficient of reduction of the cohesion | γmc = 1.25 |
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